| Preparation of porous SiC-Al2O3 ceramics via gelcasting utilising a shrinkable pore-forming agent and oxidised coarse-grained SiC | |
| Wan, Li1; Tian, Qingquan2,3; Xiang, Yun1; Chen, Lin1; Song, Jieguang1; Wang, Xianzhong1; Guo, Xinshuang1,3 | |
| Corresponding Author | Guo, Xinshuang(xsguo12b@alum.imr.ac.cn) |
| 2019-04-01 | |
| Source Publication | CERAMICS INTERNATIONAL
 |
| ISSN | 0272-8842 |
| Volume | 45Issue:5Pages:5511-5517 |
| Abstract | By utilising soaked millet as a shrinkable pore-forming agent, porous silicon carbide-alumina (SiC-Al2O3) ceramics were prepared via gelcasting. The fabrication of SiC-Al2O3 ceramics based on oxidised and unoxidised coarse-grained SiC was also studied. The water swelling, drying shrinkage, and low-temperature carbonisation of the millet were investigated. We found that the shrinkage of the soaked millet was greater than that of gel body during drying, which left large gaps that prevented shrinkage stresses from destroying the gel body. Low-temperature carbonisation of the millet should be performed slowly at 220-240 degrees C because its expansion rate increases to 45% at 250 degrees C, resulting in the cracking of samples. At a constant sintering temperature, the flexural strength of the SiC-Al2O3 ceramics prepared with SiC powders oxidised at 1000 degrees C was the highest, indicating that oxidised powders can successfully decrease the required sintering temperature and improve the flexural strength of composite ceramics. Based on our optimised process, porous SiC-Al2O3 ceramics were sintered at 1500 degrees C for 2 h. When their skeletons were fully developed, their pore sizes were in the range of 1.5-2 mm. Their porosity and flexural strength were 60.2-65.1% and 8.3-10.5 MPa, respectively. |
| Keyword | Porous SiC-Al2O3 ceramics Oxidised coarse-grained SiC Pore-forming agent Gelcasting Flexural strength |
| Funding Organization | Key Technologies R&D Program of China ; Science and Technology Project of the Jiangxi Provincial Department of Education |
| DOI | 10.1016/j.ceramint.2018.12.008 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | Key Technologies R&D Program of China[SQ2016ZYC01003836] ; Science and Technology Project of the Jiangxi Provincial Department of Education[GJJ171143] |
| WOS Research Area | Materials Science |
| WOS Subject | Materials Science, Ceramics |
| WOS ID | WOS:000459365500042 |
| Publisher | ELSEVIER SCI LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/131921 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Guo, Xinshuang |
| Affiliation | 1.Pingxiang Univ, Engn Technol Res Ctr Environm Protect Mat & Equip, Jiangxi Key Lab Ind Ceram, Pingxiang 337055, Peoples R China 2.Weinan Normal Univ, Sch Chem & Mat, Weinan 714099, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China |
| Recommended Citation GB/T 7714 | Wan, Li,Tian, Qingquan,Xiang, Yun,et al. Preparation of porous SiC-Al2O3 ceramics via gelcasting utilising a shrinkable pore-forming agent and oxidised coarse-grained SiC[J]. CERAMICS INTERNATIONAL,2019,45(5):5511-5517. |
| APA | Wan, Li.,Tian, Qingquan.,Xiang, Yun.,Chen, Lin.,Song, Jieguang.,...&Guo, Xinshuang.(2019).Preparation of porous SiC-Al2O3 ceramics via gelcasting utilising a shrinkable pore-forming agent and oxidised coarse-grained SiC.CERAMICS INTERNATIONAL,45(5),5511-5517. |
| MLA | Wan, Li,et al."Preparation of porous SiC-Al2O3 ceramics via gelcasting utilising a shrinkable pore-forming agent and oxidised coarse-grained SiC".CERAMICS INTERNATIONAL 45.5(2019):5511-5517. |
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